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SECTION C: Installation
9
Venting not shown for clarity. Heater must be vented
per instructions in this manual
Fig. 6: Minimum Clearances from Combustible
Surfaces – Indoor and Outdoor Installations
When installed according to the listed minimum clear-
ances from combustible construction, these heaters can
still be serviced without removing permanent structural
construction around the heater. However, for ease of
servicing, we recommend a clearance of at least 24 in.
in front, at least 24 in. on the rear and 10 in. above the
top of the heater. This will allow the heater to be ser-
viced in its installed location without movement or
removal of the heater.
Service clearances less than the minimum may require
removal of the heater to service either the heat ex-
changer or the burner components. In either case, the
heater must be installed in a manner that will enable
the heater to be serviced without removing any struc-
ture around the heater.
Outdoor Installations
These heaters are design-certified for outdoor installa-
tion. Heaters must not be installed under an overhang
that is less than 3 ft from the top of the vent terminal.
Three sides must be open in the area under the over-
hang. Roof water drainage must be diverted away from
heaters installed under overhangs.
Heater
Side
Min. Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
Rear 12” 24”
Right Side 1” 1”
Left Side 1” 1”
Top Unobstructed Unobstructed
Vent
Termination
12” 12”
Table E: Clearances – Outdoor Installations
The combustion air intake terminal MUST be used for
outdoor installations. The hood is shipped loose and
installed on the rear of the heater at the jobsite.
Combustion and Ventilation Air
NOTICE: Use of the heater in construction areas
where fine particulate matter, such as concrete or dry-
wall dust, is present may result in damage to the burner
that is not covered by the warranty. If operated in a
construction environment, a clean source of combus-
tion air must be provided directly to the heater.
Indoor Units
The heater must be supplied with sufficient quantities
of non-contaminated air to support proper combustion
and equipment ventilation. Combustion air can be sup-
plied via conventional means where combustion air is
drawn from the area immediately surrounding the
heater, or via direct vent, where combustion air is
drawn directly from outside. All installations must
comply with the requirements of the NFGC (U.S.) and
B149.1 (Canada), and all local codes.